By What type of piles are CFA?
Piling. Continuous flight auger (CFA) piles are drilled and concreted in one continuous operation enabling much faster installation time than for bored piles. Reinforcement is placed into the wet concrete after casting, enabling the pile to resist the full range of structural loading.
When should I use CFA piles?
Land conditions: CFA piling method is ideal for a wide variety of soil conditions— ranging from medium dense sands, gravel to rigid clays to even poor-quality rocks. The technique is not suggested for very soft clays or silts or too loose sand or gravel, though.
Are CFA piles friction piles?
Continuous flight auger piles are used for places with unstable soil conditions and high level of ground water table. These piles can be terminated in clays, granular soils, in soft rock or can be taken to hard load bearing strata i.e. bearing type of piles or friction piles due to their continuous operation.
What is the difference between CFA piles and bored piles?
Bored piles are often larger diameter than conventional continuous flight auger (CFA) piles and are used to support greater loads, overcome underground obstructions, penetrate ground too hard to bore using a continuous flight auger or create piles with a cut-off level beneath the platform level.
How do bored piles work?
The large diameter bored piles are foundation structure characterized by a cylindrical shape with a diameter larger than 600 mm; manufactured by excavating ground through a rotary drilling equipment with a complete soil removal and cast in place by casting concrete into the borehole.
What does CFA piles stand for?
The Continuous Flight Auger (CFA) process is virtually vibration free and one of the quietest forms of piling, making it ideal for environmentally sensitive areas. The method enables piles to be formed in water-bearing strata, without the need for casing or bentonite.
How does a friction pile work?
Friction piles work more like a wedge in the soil. Friction piles transmit the load from the loose topsoil above to the soil below by adhesion or friction between the surface of the pile and the soil. In other words, the friction of the soil around the pile is what holds the steel pile in place.
What is an Augered pile?
A piling technique; a Continuous Flight Augered Pile is a non-displacement pile used in difficult ground conditions. The drilling process is suitable for use in dense layers and is resistant to ground water or unstable soil conditions.
Why do piles make you bored?
Bored piles are cylindrical bodies made of concrete (with or without reinforcement) which are installed in the ground by a variety of methods. They transmit high structural loads into lower, load-bearing soils.